EP3439386B1 - Techniques to improve co-existence among multiple radios - Google Patents
Techniques to improve co-existence among multiple radios Download PDFInfo
- Publication number
- EP3439386B1 EP3439386B1 EP18196984.1A EP18196984A EP3439386B1 EP 3439386 B1 EP3439386 B1 EP 3439386B1 EP 18196984 A EP18196984 A EP 18196984A EP 3439386 B1 EP3439386 B1 EP 3439386B1
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- EP
- European Patent Office
- Prior art keywords
- wwan
- frame
- radio
- wpan
- transceiver
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0008—Synchronisation information channels, e.g. clock distribution lines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
- H04W56/005—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by adjustment in the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
Definitions
- the subject matter disclosed herein relates to managing co-existence of multiple radios.
- MRPs Multi-Radio Platforms
- FIG. 1 depicts a scenario involving a multi-radio mobile terminal that performs a network scan to establish a wireless wide area network (WWAN) connection with a WWAN base station while attempting to maintain continuous service over an active wireless local area network (WLAN) connection (e.g., VoIP) with a wireless personal area network (WPAN) accessory (e.g., a Bluetooth headset).
- WLAN wireless local area network
- WPAN wireless personal area network
- Time Division Multiplex is a common solution for the coexistence of multiple radios on the same device.
- TDM prevents inter-radio interference or resource conflict by interleaving co-located radio activities over time.
- WLAN and WPAN operations are blocked during a network scan to establish a WWAN connection.
- a network scan to establish a WWAN connection involves detecting frame preambles. For example, under IEEE 802.16e, there are 96 preambles that uniquely identify 32 different cell IDs and three different sectors. Therefore, for one scan per preamble, the total number of scans per channel is 96. If one frame is 5 ms and each scan takes about three frames, it takes approximately 1.44 seconds to scan all preambles over one channel. It is undesirable to block WLAN and WPAN operations for such a long time, particularly when WLAN and WPAN radios are transmitting data traffic.
- US 2007/0275746 A1 relates to a multifunction communication terminal, which can communicate simultaneously with WLAN access points, WiMax base stations, and Bluetooth enabled devices without mutual interference when operating in the same or overlapping frequency bends.
- US 2007/0232358 A1 relates to a coexistence mechanism for enabling Bluetooth and WiMax radios to coexist in the same mobile handset terminal implemented in the MAC layer of the Bluetooth and WiMax radio modules.
- a method performed by a wireless communication device comprising, disabling transmission by a WLAN transceiver during a WWAN scan interval; permitting transmission by both a WPAN transceiver and a WWAN transceiver during the WWAN scan interval; and adjusting a time slot of a frame transmitted by the WPAN transceiver in the WWAN scan interval based on one or more preambles of frames from the WWAN transceiver.
- the method further comprises: disabling transmission by the WWAN transceiver during a further time region; and permitting transmission by the WLAN transceiver during the further time region.
- adjusting a time slot of a frame transmitted by the WPAN transceiver comprises detecting a frame boundary of a frame from the WWAN transceiver.
- detecting a frame boundary comprises detecting N preambles, where a period between the N preambles equals a period of the frame from the WWAN transceiver.
- adjusting a time slot of a frame transmitted by the WPAN transceiver comprises: generating a frame synchronization signal, and aligning the time slot of the frame with a portion of the frame synchronization signal.
- generating a frame synchronization signal comprises determining offset and period parameters of the frame synchronization signal.
- an apparatus comprising a WLAN radio; a WPAN radio; a WWAN radio; and control logic adapted to: disable transmission by the WLAN radio during a WWAN scan interval, permit transmission by both the WPAN radio and the WWAN radio during the WWAN scan interval, and adjust a time slot of a frame transmitted by the WPAN radio in the WWAN scan interval based on one or more preambles of frames from the WWAN radio.
- control logic is further adapted to: disable transmission by the WWAN radio during a further time region, and permit transmission by the WLAN radio during the further time region.
- control logic in adjusting a time slot of a frame transmitted by the WPAN radio, is adapted to detect N preambles, where a period between the N preambles equals a period of the WWAN radio frame.
- control logic is further adapted to detect a frame boundary of a frame of the WWAN radio.
- control logic in detecting a frame boundary of a frame of the WWAN radio, is adapted to detect N preambles, where a period between the N preambles equals a period of the frame of the WWAN radio.
- control logic in adjusting a time slot of a frame transmitted by the WPAN radio, is adapted to: generate a frame synchronization signal, and align at least one of the time slots of a radio frame associated with the WPAN radio with a portion of the frame synchronization signal.
- a system comprising the apparatus described above and at least one antenna communicatively coupled to one or more of the WLAN, WPAN, and WWAN radios.
- Embodiments of the invention may be used in a variety of applications. Some embodiments of the invention may be used in conjunction with various devices and systems, for example, a transmitter, a receiver, a transceiver, a transmitter-receiver, a wireless communication station, a wireless communication device, a wireless Access Point (AP), a modem, a wireless modem, a Personal Computer (PC), a desktop computer, a mobile computer, a laptop computer, a notebook computer, a tablet computer, a server computer, a handheld computer, a handheld device, a Personal Digital Assistant (PDA) device, a handheld PDA device, a network, a wireless network, a Local Area Network (LAN), a Wireless LAN (WLAN), a Metropolitan Area Network (MAN), a Wireless MAN (WMAN), a Wide Area Network (WAN), a Wireless WAN (WWAN), devices and/or networks operating in accordance with existing IEEE 802.11, 802.11a, 802.11b, 802.11e, 802.11g, 802.
- Some embodiments of the invention may be used in conjunction with one or more types of wireless communication signals and/or systems, for example, Radio Frequency (RF), Infra Red (IR), Frequency-Division Multiplexing (FDM), Orthogonal FDM (OFDM), Time-Division Multiplexing (TDM), Time-Division Multiple Access (TDMA), Extended TDMA (E-TDMA), General Packet Radio Service (GPRS), Extended GPRS, Code-Division Multiple Access (CDMA), Wideband CDMA (WCDMA), CDMA 2000, Multi-Carrier Modulation (MDM), Discrete Multi-Tone (DMT), Bluetooth (RTM), ZigBee (TM), or the like.
- RF Radio Frequency
- IR Frequency-Division Multiplexing
- OFDM Orthogonal FDM
- TDM Time-Division Multiplexing
- TDM Time-Division Multiple Access
- TDMA Time-Division Multiple Access
- E-TDMA Extended TDMA
- FIG. 2 depicts a multi-radio platform 200, in accordance with an embodiment of the present invention.
- WWAN radio 202 includes the capability to operate as a transceiver in compliance with IEEE 802.16
- WPAN radio 204 includes the capability to operate as a transceiver in compliance with Blue Tooth
- WLAN radio 206 includes the capability to operate as a transceiver in compliance with IEEE 802.11.
- WWAN radio 202, WPAN radio 204, and WLAN radio 206 need not be on the same platform but instead could be located on one or more separate platforms.
- WWAN radio 202 includes the capability to transmit signals FRAME_SYNC and RF_KILL to a WPAN radio 204 and WLAN radio 206, respectively.
- signals FRAME_SYNC and RF_KILL control the WWAN scanning process and may improve co-existence among WWAN and WPAN radios.
- a bus (not depicted) or general purpose input/output (GPIO) can be used to transmit signals FRAME_SYNC and RF_KILL.
- wireless communications may be used to transmit signals FRAME_SYNC and RF_KILL.
- Signal FRAME_SYNC may be a reference signal that allows WPAN radio 204 to align its time slots to avoid interference by preambles of WWAN frames.
- WPAN radio 204 may align its nearest (recent or future) SCO or eSCO (RX) slot boundary to a rising edge of the FRAME_SYNC signal.
- SCO eSCO
- One embodiment of signal FRAME_SYNC is described in more detail in U.S. Patent Application entitled "ARCHITECTURE AND METHODS FOR COEXISTENCE OF WIRELESS RADIOS HAVING DIFFERING PROTOCOLS," inventors Guo et al., filed April 6, 2007, having serial number 11/697,369 (attorney docket P25771).
- WPAN radio 204 may control the timing of the commencement of time slots so that (1) time slots are sequential with no gap and (2) a time slot aligns with a rising edge of the signal FRAME_SYNC. WPAN radio 204 may notify other WPAN radios of the shift in time slots using the relevant protocols.
- Signal RF_KILL may be used to arbitrate the transmission activities of WLAN radio 206.
- RF_KILL may be used to arbitrate the transmission activities of WLAN radio 206.
- r(t) to denote the RF_KILL signal
- WWAN radio 202 includes control logic 203 that controls the format of the signal FRAME_SYNC and timing of when to transmit signals FRAME_SYNC and RF_KILL.
- Control logic 203 divides the scanning process into preamble detection and frame boundary detection, and uses the reference time provided by the detected preamble during a first time period to align WPAN radio activities such that collisions at a second time period may be avoided.
- control logic 203 controls the process described with regard to FIG. 3 .
- FIG. 3 depicts a process 300 that can be used to reduce interference between WPAN frames and WWAN preambles, in accordance with an embodiment of the present invention.
- Process 300 may execute at the beginning of each WWAN scan period.
- Table 1 shows an example of WWAN parameters used in process 300.
- Table 1 T1 T2 Tf C th 1 C th 2 Desc.
- WWAN inactive interval WWAN active interval frame duration frame boundary detection threshold preamble detection threshold Value (example) 9 ms 21 ms 5 ms 2 1
- Block 302 may include waiting for the end of a WLAN active interval.
- the duration of T1 may be set as the time in which a WLAN radio is active but a WWAN radio is inactive. In one implementation, duration T1 is 9 ms.
- signal RF_KILL may be set to 0 to enable the WLAN radio during the duration of time T1.
- Block 304 may include disabling the WLAN radio after the end of the WLAN active interval.
- Block 304 may also include activating the WWAN radio for a duration of T2.
- T2 is 21 ms.
- signal RF_KILL may be set to 1 in order to disable the WLAN radio during the duration of time T2.
- Block 306 may include performing initialization. Initialization may include (1) choosing frequency (f) to scan for WWAN frames; (2) receiving an indication of the symbol for a preamble (s); and (3) resetting variables t0 and t1 to zero. Variable t0 may indicate a time at which a previous preamble was detected whereas variable t1 may indicate the time a current preamble has been detected.
- Block 308 may include resetting preamble counter C to zero.
- Counter C indicates the number of successive detected preambles with the interval between preambles equal to Tf.
- Block 310 may include determining whether a WWAN scan interval has ended. For example, the scan interval for a WWAN radio may be set as time T2. If the WWAN scan interval ended, then block 312 may follow block 310. If the WWAN scan interval has not ended, then block 320 may follow block 310.
- Block 312 may include enabling the WLAN radio for transmission.
- signal RF_KILL may be set to 0 in order to enable the WLAN radio.
- the WLAN radio may be enabled for a duration of time T1.
- Block 320 may include determining whether a preamble has been detected in the WWAN scan interval.
- the preamble may have been transmitted in a WWAN frame by a WWAN base station. Detection of a preamble may occur by the cross-correlation based preamble detection technique described in P. Cheng et al., A Study on Cell Search Algorithms for IEEE 802.16e OFDMA Systems, IEEE WCNC (2007 ). If a preamble is detected, block 322 may follow block 320. If a preamble is not detected, block 310 may follow block 320.
- Block 322 may include setting the timer variable for the previous and current detected preambles.
- Block 322 may include setting the variable t0 for a previously detected preamble to equal the time in which a previous preamble was detected.
- Block 322 may also include setting variable t1 to equal the clock count at the time when the most recent preamble was detected. In a first iteration of block 322, t0 may be set to time zero and t1 may be set to the current clock count.
- Block 324 may include determining whether a WWAN frame boundary has been met. Block 324 may include determining whether the time difference between a preamble occurrence at time t1 and preamble occurrence at time t0 is a WWAN frame duration, Tf. A WWAN frame duration may be 5 ms. If a WWAN frame boundary is detected, then block 326 may follow block 324. If a WWAN frame boundary is not detected, then block 308 may follow block 324. Block 324 may be used to verify that a most recently detected preamble is a preamble by determining whether a time between successive preambles coincides with a WWAN frame duration.
- Block 326 may include incrementing the preamble counter, variable C.
- Block 328 may include determining whether a sufficient number of preambles has been detected to verify the period of a WWAN frame.
- a sufficient number of measured preambles may be set by variable C th 1.
- C th 1 is two, however, other values can be used. Accordingly, for example, if two time durations are measured between preambles and both time durations match the frame period Tf, then process 300 is satisfied that periodic WWAN frames have been detected. If a sufficient number of preambles has been detected, then process 300 ends. If a sufficient number of preambles has not been detected, then block 330 follows block 328.
- the WWAN preamble may be corrupted once every three frames, and only one period with two preambles can be received without interference, thus leading to C th 1 being set as one.
- C th 1 may be set to at least two to minimize false alarms, i.e., successfully detecting preambles in three consecutive frames.
- Block 330 may include determining whether a sufficient number of preambles has been detected in order to begin synchronization of WPAN frames. For example, variable C th 2 may establish the number of detected preambles in order to begin synchronization of WPAN frames. In this example, variable C th 2 is one, but other values can be used such as zero or two or more. If a number of counted preambles matches variable C th 2, then block 332 may follow block 330. If a number of counted preambles does not match variable C th 2, then block 310 may follow block 330.
- Block 332 may include generating a FRAME_SYNC signal.
- the FRAME_SYNC signal may include parameters: offset and period, denoted by d and p, respectively.
- Parameter d indicates the duration between a beginning of the detected preamble and the first rising edge of the FRAME_SYNC signal after the detected preamble.
- Parameter p indicates the period of rising edges of the FRAME_SYNC signal.
- the duration d can be set at a minimum of the processing delay of the WWAN radio in detecting the presence of a preamble.
- the period p may be set to correspond to the smallest possible frequency given hardware constraints. Accordingly, integers m and n are chosen to achieve the desired duration and period values.
- a WPAN radio assigns time slots based on rising edges of the FRAME_SYNC signal.
- FIG. 5 provides an example of the assignment of time slots by a WPAN radio in relation to the FRAME_SYNC signal.
- FIG. 4 illustrates a FRAME_SYNC signal in relation to a WWAN frame, in accordance with an embodiment of the present invention.
- WWAN frame 400 has a frame duration ofTf, which includes eight time slots (Ts).
- Ts time slots
- a preamble is transmitted during the first time slot of the WWAN frame 400.
- a first rising edge of signal FRAME_SYNC 402 occurs at time d from the beginning of the WWAN frame. Subsequent transitions from 0 to 1 occur at a period p from the first transition.
- the relationships for d and p may ensure that WPAN transmission slots will only occur on the even slots of a WWAN frame (e.g., slots 2, 4, 6, or 8), thereby avoiding the first time slot in each WWAN frame in which the preamble is located. This relationship may avoid collision between WPAN transmissions and WWAN preamble transmission.
- FIG. 5 illustrates an example showing alignment of time slots of a WPAN link in relation to a synchronization signal, in accordance with an embodiment of the present invention.
- the example of FIG. 5 shows periodic WLAN active intervals followed by WWAN scan intervals.
- the WLAN active intervals are 9 ms whereas the WWAN scan intervals are 21 ms.
- the WPAN link is periodic with one transmit slot followed by one receive slot among six slots.
- one WPAN time slot has the same size as one time slot of a WWAN link.
- a WWAN frame is divided into continuous intervals with equal duration and each interval is called a time slot (Ts).
- Ts time slot
- one time slot is 625 ⁇ s so that a 5 ms WWAN frame includes exactly 8 time slots.
- the WWAN frame can be represented as having 625 ⁇ s time slots in order to align with WPAN radio (e.g., Blue Tooth) time slots.
- WPAN radio e.g., Blue Tooth
- a WPAN radio transmits five complete WPAN frames and a WWAN radio transmits four complete WWAN frames.
- the first transmit period of the WPAN frame interferes with the first WWAN frame preamble so that the first WWAN frame preamble is not detected.
- signal FRAME_SYNC a time slot of the WPAN frame is delayed so that it can be aligned with a rising edge of signal FRAME_SYNC.
- the WPAN radio receives signal FRAME_SYNC and waits until after a current WPAN frame completes before delaying the transmit interval and the receive interval so that (1) the transmit interval time slot is immediately prior to the receive interval time slot and (2) the receive interval time slot aligns with a rising edge of signal FRAME_SYNC. Delaying commencement of the receive time slot of a WPAN frame until a rising edge of signal FRAME_SYNC causes the preamble of a WWAN signal to not collide with a WPAN frame.
- the transmit interval time slot of a WPAN frame is delayed until a rising edge of signal FRAME_SYNC.
- Other time slots of a WPAN frame can be delayed to begin on the rising edge of signal FRAME_SYNC and to avoid collision with a preamble of a WWAN frame.
- a master WPAN radio may adjust time slot activity between the master WPAN radio and servant WPAN radio. Adjusting the time slot activity may avoid interference caused by a preamble of a WWAN frame.
- Embodiments of the present invention may be implemented as any or a combination of: one or more microchips or integrated circuits interconnected using a motherboard, hardwired logic, software stored by a memory device and executed by a microprocessor, firmware, an application specific integrated circuit (ASIC), and/or a field programmable gate array (FPGA).
- logic may include, by way of example, software or hardware and/or combinations of software and hardware.
- Embodiments of the present invention may be provided, for example, as a computer program product which may include one or more machine-readable media having stored thereon machine-executable instructions that, when executed by one or more machines such as a computer, network of computers, or other electronic devices, may result in the one or more machines carrying out operations in accordance with embodiments of the present invention.
- a machine-readable medium may include, but is not limited to, floppy diskettes, optical disks, CD-ROMs (Compact Disc-Read Only Memories), and magneto-optical disks, ROMs (Read Only Memories), RAMs (Random Access Memories), EPROMs (Erasable Programmable Read Only Memories), EEPROMs (Electrically Erasable Programmable Read Only Memories), magnetic or optical cards, flash memory, or other type of media / machine-readable medium suitable for storing machine-executable instructions.
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Mobile Radio Communication Systems (AREA)
- Time-Division Multiplex Systems (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/220,990 US8121068B2 (en) | 2008-07-30 | 2008-07-30 | Techniques to improve co-existence among multiple radios |
EP09166747.7A EP2150085B1 (en) | 2008-07-30 | 2009-07-29 | Techniques to improve co-existence among multiple radios |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09166747.7A Division-Into EP2150085B1 (en) | 2008-07-30 | 2009-07-29 | Techniques to improve co-existence among multiple radios |
EP09166747.7A Division EP2150085B1 (en) | 2008-07-30 | 2009-07-29 | Techniques to improve co-existence among multiple radios |
Publications (2)
Publication Number | Publication Date |
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EP3439386A1 EP3439386A1 (en) | 2019-02-06 |
EP3439386B1 true EP3439386B1 (en) | 2020-04-22 |
Family
ID=41161896
Family Applications (4)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09166747.7A Not-in-force EP2150085B1 (en) | 2008-07-30 | 2009-07-29 | Techniques to improve co-existence among multiple radios |
EP18196983.3A Active EP3439385B1 (en) | 2008-07-30 | 2009-07-29 | Techniques to improve co-existence among multiple radios |
EP18196981.7A Active EP3439384B1 (en) | 2008-07-30 | 2009-07-29 | Techniques to improve co-existence among multiple radios |
EP18196984.1A Active EP3439386B1 (en) | 2008-07-30 | 2009-07-29 | Techniques to improve co-existence among multiple radios |
Family Applications Before (3)
Application Number | Title | Priority Date | Filing Date |
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EP09166747.7A Not-in-force EP2150085B1 (en) | 2008-07-30 | 2009-07-29 | Techniques to improve co-existence among multiple radios |
EP18196983.3A Active EP3439385B1 (en) | 2008-07-30 | 2009-07-29 | Techniques to improve co-existence among multiple radios |
EP18196981.7A Active EP3439384B1 (en) | 2008-07-30 | 2009-07-29 | Techniques to improve co-existence among multiple radios |
Country Status (9)
Country | Link |
---|---|
US (1) | US8121068B2 (ko) |
EP (4) | EP2150085B1 (ko) |
KR (1) | KR101124141B1 (ko) |
CN (1) | CN101640565B (ko) |
DK (1) | DK2150085T3 (ko) |
ES (1) | ES2707553T3 (ko) |
HU (1) | HUE043919T2 (ko) |
PL (1) | PL2150085T3 (ko) |
PT (1) | PT2150085T (ko) |
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US8121068B2 (en) | 2012-02-21 |
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PL2150085T3 (pl) | 2019-04-30 |
CN101640565B (zh) | 2014-07-09 |
EP3439384B1 (en) | 2020-04-22 |
HUE043919T2 (hu) | 2019-09-30 |
DK2150085T3 (en) | 2019-02-25 |
KR101124141B1 (ko) | 2012-03-21 |
EP2150085A2 (en) | 2010-02-03 |
EP3439385B1 (en) | 2020-04-22 |
PT2150085T (pt) | 2019-02-04 |
EP3439384A1 (en) | 2019-02-06 |
EP3439386A1 (en) | 2019-02-06 |
US20100027525A1 (en) | 2010-02-04 |
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